I have those Harbor Freight bins that were linked earlier in this thread. They are different. They stack differently. There are notches on the top edges, 2 per side, where the feet of the one above it sit into. They are a bit smaller than the ones that come with the Lee presses. They feel cheaper plastic and I've had a couple break on me.

The AkroBins that came with my Lee presses have a beveled bottom edge on each side that slides into the top of the one below it. The bins I picked up at Menards are the same way and they will fit/attach to the one's I have that came with the presses.